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claws

Member
Mar 27, 2023
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RIO VISTA, California, Solano
Just joined this forum and have a question or two. I've ordered a GAMO Arrow in .22cal and am wondering if I can adjust the velocity downward by not filling the rifle to maximum pressure. Would this increase accuracy at the expense of shot count? I bought this rifle because it's supposed to be very quiet and has a relatively low velocity for a PCP rifle. I'm limited to 25 yard shooting by the size of my backyard and I don't want to annoy my neighbors.

Thanks,
Kim
 
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Claws,
Welcome, glad to have you here. Suggest review of Matt Dubber's, "Air Gun Ballistics, 101," video series, was a big help for understanding regulated versus unregulated PCP performance. Simple answer is pellets prefer a certain velocity for self-stabilization and accuracy, too much air, or too little, accuracy suffers. WM
 
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Even though airguns can fill to a certain "max pressure" most airguns have a sweet spot where they'll shoot most efficiently. One of mine CAN fill to 250 bar but it's most efficient if I only fill to around 240 & start from there. Don't know if your gun has a regulator or not & Filling with less air doesn't make it quieter until it drops off reg, which you DON'T want to do. Best way to quiet it is get a moderator & NOT shoot it at lower pressures. Amount of pressure should not be used as a method to tame the bark. You want to keep it shooting efficiently. That's what they're meant to do. Welcome aboard!
 
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I haven’t had an Arrow in my hands but AGD’s review says it’s a pretty sedate unregulated PCP. It’s counterintuitive at first but with unregulated PCPs, they tend to be quieter when operating nearer the top of the pressure range. That’s because when the pressure is high, the hammer barely knocks the valve open, releasing a very short blip of air. Whereas at low pressure, the valve is knocked open more forcefully and stays open longer and sounds louder as a consequence.

With that said, probably the best thing to do is simply try it at each end and see what you think.
 
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no not really,thats not how a pcp works.
there are other adjustments that can allow you to drop velocity a bit,
but it takes a chronograph to do it right,
and it would take hours to type an explanation lol

so,youll learn alot about how a pcp works if you do some searches for::::
"shot curve" "bell curve"

on an unregulated pcp,
if you fill to the low end of your fill pressure,
your velocity will start dropping off much sooner.

but on a regulated gun youll just decrease shot count.

big velocity swings usually hurt accuracy,
but if youre only shooting 25yds or so then you wont see as much of a change.

a chronograph is a must have to properly setup a pcp,imo.
 
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